sargassum noun. [sɑ:'gasǝm] E20.
[mod. Latin (see below), from SARGASSO.]
Any brown alga of the genus Sargassum, the members of which are kept afloat by air-filled bladders and form dense floating masses in warmer parts of the Atlantic (also called gulfweed, sargasso); a mass of such alga.

Comb.:
sargassum fish a small toadfish, Histrio histrio, which lives in clusters of sargassum; also called mouse-fish.

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